Carburetor air valve



June 8, 1926.

L. C. WEINBERG ET AL CARBU EiETOR AIR vALvE Filed August 13 1921 2 Sheets-Sheet 1 June 8 1926.

1,588,215 L. C. WEINBERG ET AL CARBURETOR AIR VALVE Filed August 15. '2 Sheets-Sheet 2 Patented June 8, 1926.

UNITED STATES PATENT OFFICE.

LOWELL C. WEINBERG AND HERBERT E. BRANNON, 0F DAYTON, OHIO.

CARBURETOR AIR VALVE.

Application filed August 13, 1921. Serial no. 492,206.

This invention relates to carburetors in general and more particularly to a barometrically operated device for automatically regulating and controlling same.

Especially in aircraft internal combustion engines it has been found that the action of the carburetor varies in accordance with the change in barometric pressure. It is therefore proposed to provide automatic means for adapting the carburetor to function properly at all altitudes. This automatic means is to consist of a device actuated by the varying barometric pressureand to be connected to the intake manifold immediate ly above the carburetor so that the proportions of fuel vapor and air will be automatically regulated according to the prevailing barometric pressure, With the foregoing and other objects'in view, which will appear as the description proceeds, the invention resides in the combination of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention, herein disclosed may be made within the scope of what is claimed, with-. out departing from the spirit of the invention, the specific embodiment of which is illustrated in the attached drawings, in which,

Figure 1 is a vertical longitudinal section of the device on the line 1-1 of Figure 2.

Figure 2 is a bottom plan view of the air valve with parts of the carburetor shown in section.

Figure 3 is an enlarged detail section of the bellows construction.

As shown more clearly in Figure 2, 6 is the vertically extending pipe to the mani- "fold and is provided with the usual butter ertures 8 in the form of vertical slots, ex-

fly valve 7, Venturi tube 4, and the carbu-' retor jet 5 with the discharge opening 5', Between the Venturi 4 and the butterfly valve 7 the pipe 6 is provided with a series of aptending through and around the entire periphery of the pipe 6. A collar 3 is provided with a horizontally extending flange 11 and is securely fitted to pipe 6, by any suitable means which will enable said collar to be vertically adjusted with relation to walls-2, 2, and 2 upwardly.

2 and 2 and a top plate E2. provided with apertures 9 in direct line'with apertures 10 of the flange 11.

A flexible diaphragm of the bellows type 1 is arranged between the flange 11 and the top plate 2; In case a metallic bellows is used the ends may be soldered or otherwise fastened to the lates 2 and 11. However, 1f the bellows 1s made of fabric material such as rubberized silk it is found advisable to brace the Walls thereof and add metallic members for fastening the upper and lower extremities.

As shown more clearly in Figure 3, the upper and lower ends of the fabric bellows are connected to plates 2 and 11 by'means ends of the bellows.

In order to restrict the expansion and con traction of the bellows so that the movement of the bellows will take place in a vertical plane, there are provided retaining rings 15 and 17 inside the rings 14 and 16 outside of the bellows in order to 'prevent'lateral expansion or contraction of said bellows.

Thus it will be seen that as the barometric pressure becomes less, due to changes in atmospheric conditions or an ascent to higher altitudes, the bellows expands and consequently forces the container comprising he wall 2" is adapted to slide on the exterior surface of the pipe 6; upon this upward movement the slots 8 will be opened to allow the inrush of air from outside through the ports 9 and 10. The amount of inrushing air is thus regulated by the amount of expansion or contraction caused in the bellows by changes in the prevailing barometric pressure;

' It will be seen from the foregoing descripwhen the barometric pressure lnoreases and expanding when the ressure decreases, the movements of the flexible walls being transmitted by mechanism to the air regulating valve which will cause the minimum lost motion and frictional interference. As the pressure decreases with increasing altitude, the sliding valve '2 will gradually open the increasing the intake slots thus gradually as compared to proportion of air admitte the combustible fuel.

We claim:

In combination, in a carburetor having an air inlet, a fuel inlet, and a mixture outlet, a throttle valve in said mixture outlet, a plurality of openings in the wall of said carburetor between the fuel nozzle thereof and the throttle valve, a sleeve slidable on the exterior wall of said carburetor and having openings adapted to be brought. into registration with the openings in said carburetor wall, and means responsive to variations in atmospheric pressure to cause said openings to move into registration as the atmospheric pressure decreases.

In testimony whereof we have affixed our signatures.

LOWELL o. WEINBERG. HERBERT E. BRANNON. 

